Directions

Preheat oven to 425F.

Line bottom of an 8- 10 cup baking dish with parchment paper& coat with half the butter.

Peel both types of potatoes, cut into 1/4 inch thick slices& arrange the half of the regular potatoes in layers in the prepared dish; sprinkle each layer with some of the olive oil& some of the seasonings.

Arrange all of the sweet potatoes on top; sprinkle with some of the olive oil& seasonings.